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  1. #1

    No smoke/condensation from my furnace's exhaust vent

    Hello,

    I notice smoke from my neighbor's furnace vent (outside one which is in the roof) in the early AM or night when their furnace/heat is ON. Same thing does not happen for my outside vent when my heater is on. This happens all the time irrespective if it is very cold outside or not. Note that I live in a community where all houses have a gas based furnace.

    Can anyone advise if I should be concerned? I am also not sure what this smoke is. So please educate me if possible.

    Thanks in advance.

    JrMbr

  2. #2
    Join Date
    Feb 2008
    Location
    Altmar, New York, United States
    Posts
    4,797
    sounds like you should be concerned for your neighbor's. i would call someone to get it checked out. are you sure it is smoke you see?

  3. #3
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,358
    More likely water vapor, a byproduct of combustion. Your neighbor may have a lower efficiency furnace than you do, so more waste heat is going up the stack. Could also be he has a shorter flue run than you do, meaning less vapor is condensing out on the flue walls, or it is running through a warmer attic. Could be his furnace uses less dilution air than yours, or is a bit starved for combustion air. Could be any number of things.

    It does not necessarily mean your neighbor's furnace is in trouble, or yours. The best way to eliminate any doubt is to have a conbustion analysis done on your furnace, if you're that curious.
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    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


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  4. #4
    Join Date
    Dec 2002
    Location
    Toledo, Ohio, United States
    Posts
    12,911
    Twilli says take door off and change wiring around a little and then perhaps you'll see some smoke
    Last edited by Twilly; 02-23-2009 at 07:35 PM.
    No Heat No Cool You need Action Fast

  5. #5
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
    Posts
    2,032
    Quote Originally Posted by JrMbr View Post
    Hello,

    I notice smoke from my neighbor's furnace vent (outside one which is in the roof) in the early AM or night when their furnace/heat is ON. Same thing does not happen for my outside vent when my heater is on. This happens all the time irrespective if it is very cold outside or not. Note that I live in a community where all houses have a gas based furnace.

    Can anyone advise if I should be concerned? I am also not sure what this smoke is. So please educate me if possible.

    Thanks in advance.

    JrMbr

    This is not the correct way to get this concern of yours answered. There can be many reasons why you see "exhaust" from your neighbors chimney/vent and not from yours and the only way you're going to get a correct and accurate answer is to have your heating equipment checked by a qualified technician. This is something that should be done yearly anyhow.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  6. #6
    First of all thanks to those who responded.

    Reason for my concern was I feel there is a leak in my air-ducts, may be because of that the condensation/vapor is melting prior to reaching the exhaust and hence no smoke. Why I feel there is a leak? I checked some vents in the home and in one of the vent I feel small flow cold air when the heater is not ON.

    Is there any professional on this board who provides HVAC service in Central NJ near Middlesex county?

    Regards.

  7. #7
    Join Date
    Oct 2008
    Location
    Tol.,Oh.
    Posts
    80
    O.K. Who's clowning around?

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,330
    There are several members of this board from NJ.

    Just not sure which ones anymore.
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    How many times must one fix something before it is fixed?

  9. #9
    Join Date
    Nov 2008
    Location
    Colorado
    Posts
    2,687
    Quote Originally Posted by twilli3967 View Post
    Twilli says take door off and change wiring around a little and then perhaps you'll see some smoke
    LOL

  10. #10
    Join Date
    Dec 2008
    Posts
    112
    Quote Originally Posted by JrMbr View Post
    Hello,

    I notice smoke from my neighbor's furnace vent (outside one which is in the roof) in the early AM or night when their furnace/heat is ON. Same thing does not happen for my outside vent when my heater is on. This happens all the time irrespective if it is very cold outside or not. Note that I live in a community where all houses have a gas based furnace.

    Can anyone advise if I should be concerned? I am also not sure what this smoke is. So please educate me if possible.

    Thanks in advance.

    JrMbr
    Is your neighbor Native American?

  11. #11
    Join Date
    Dec 2002
    Location
    Toledo, Ohio, United States
    Posts
    12,911
    No Heat No Cool You need Action Fast

  12. #12
    check you return connections at the a/h for tightness and make sure the room/basement has an adequate supply of combustion air, if your equipment doesnt have its own fresh air intake

  13. #13
    Join Date
    Feb 2009
    Location
    north of 49
    Posts
    233
    This happens in my neighborhood all the time....They're called GROW OPPS

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